Java 计算器错误

Question

我正在 JAVA 中开发一个简单的计算器，因为我正在尝试使用 GUI 进行试验。我有运行一些错误，但调试器仍未解决这些错误..

计算器上代表 *、- 等的按钮无法正常工作，唯一正常工作的是加号按钮，它可以正常工作。

除法按钮从不输出任何东西，它输出一个错误，说它不能被零除。这是最奇怪的一个，因为如果输入或保存的数字为零，它肯定会影响加号答案，但事实并非如此。

乘法按钮输出零作为答案，减号按钮将两个数字相加而不是相减。

如果有人看到上述任何问题的原因，请告诉我..

 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;

  //Version 1.0

 public class App {
  private JLabel txt;
  private JPanel main;
  private JButton one;
  private JButton three;
  private JButton nine;
  private JButton seven;
  private JButton eight;
  private JButton two;
  private JButton four;
  private JButton six;
  private JButton clear;
  private JButton min;
  private JButton div;
  private JButton times;
  private JButton zero;
  private JButton five;
  private JButton button1;
  private JButton plus;

//Variables are declared
int num1;
int num2;
int ans;

boolean kms = false;

int input;
/* boolean multiplication = false;
boolean division = false;
boolean subtract = false;
boolean addition = false;*/

public App() {

    txt.setText("0");


    times.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            txt.setText("*");
            input = 1;
            kms = true;
        }
    });

    div.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            txt.setText("/");
            kms = true;
            input = 2;
        }
    });

    min.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            txt.setText("-");
            kms = true;
            input = 3;
        }
    });

    plus.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            txt.setText("+");
            kms = true;
            input = 4;
        }
    });

    clear.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            ans = 0;
            num1 = 0;
            num2 = 0;
            txt.setText("");
        }
    });

    if(kms == true){

        //Second number being inputted
        num1 = Integer.parseInt(txt.getText());
        txt.setText("");

        one.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText(txt + "1");
                num2 = num2 + 1;

            }
        });
        two.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("2");
                num2 = num2 + 2;
            }
        });
        three.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("3");
                num2 = num2 + 3;
            }
        });
        four.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("4");
                num2 = num2 + 4;
            }
        });
        five.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("5");
                num2 = num2 + 5;
            }
        });
        six.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("6");
                num2 = num2 + 6;
            }
        });
        seven.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("7");
                num2 = num2 + 7;
            }
        });
        eight.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("8");
                num2 = num2 + 8;
            }
        });
        nine.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("9");
                num2 = num2 + 9;
            }
        });
        zero.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("0");
                num2 = num2 + 0;
            }
        });

        num2 = Integer.parseInt(txt.getText());

    }else if(kms == false){
        //First number being inputted
        one.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("1");
                num1 = num1 + 1;
            }
        });
        two.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("2");
                num1 = num1 + 2;
            }
        });
        three.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("3");
                num1 = num1 + 3;
            }
        });
        four.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("4");
                num1 = num1 + 4;
            }
        });
        five.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("5");
                num1 = num1 + 5;
            }
        });
        six.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("6");
                num1 = num1 + 6;
            }
        });
        seven.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("7");
                num1 = num1 + 7;
            }
        });
        eight.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("8");
                num1 = num1 + 8;
            }
        });
        nine.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("9");
                num1 = num1 + 9;
            }
        });
        zero.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("0");
                num1 = num1 + 0;
            }
        });

        num2 = Integer.parseInt(txt.getText());

        button1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                switch(input){
                    case 1:
                        ans = num1 * num2;
                        txt.setText("Answer is " + ans);
                    break;
                    case 2:
                        ans = num1 / num2;
                        txt.setText("Answer is " + ans);
                    break;
                    case 3:
                        ans = num1 - num2;
                        txt.setText("Answer is " + ans);
                    break;
                    case 4:
                        ans = num1 + num2;
                        txt.setText("Answer is " + ans);
                    break;
                }
            }
        });


    }
}




public static void main(String[] args) {

    JFrame frame = new JFrame("Calculator");
    frame.setBackground(Color.white);
    frame.setVisible(true);
    frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(new App().main);
    frame.pack();
}

}

Answer 1

根据你在上面的代码中所做的，如果你输入只有一位的整数，它会完美地工作。

Ex: add 5 then num1=5 and press + button then kms is true, then enter 6 and num2=6 now if you press the result the result will be 11.

但是如果您尝试在结果前输入另一个数字，则输入的数字将像 num2 = num2 + newAddedDigit 一样添加到 num2 而不是连接到 num2

因此，为了获得计算器的真正功能，请尝试连接 num1 和 num2

按下的数字按钮

Java 计算器错误

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